Projection-type image display apparatus

Abstract

A projection-type image display apparatus includes a body including an air inlet and an air outlet and accommodating a heating element; a lamp unit including a light-source lamp and a housing that accommodates the light-source lamp and that includes an air intake and an exhaust opening communicating with the air outlet; a duct unit including a first end adjacent to the air inlet, a second end adjacent to the air intake, and a flow channel connecting the first and second ends; a radiating unit thermally connected to the heating element, at least part of the radiating unit being disposed inside the flow channel of the duct unit; and a fan, drawing air from the air inlet through the first end of the duct unit and sending the air to the air intake through the second end, disposed between the radiating unit and the second end.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of priority of Japanese Patent Application No. 2004-162485, filed May 31, 2004, the entire contents of which are incorporated herein by reference. BACKGROUND [0002] 1. Field [0003] The present invention relates to projection-type image display apparatuses projecting enlarged images shown on display devices onto screens, and in particular, relates to projection-type image display apparatuses including structures for cooling the display devices, light-source lamps, or the like. [0004] 2. Description of the Related Art [0005] Projection-type image display apparatuses enlarge images shown on display devices such as small cathode-ray tubes (CRTs) or light valves (small display devices capable of storing and removing the images in real time) through projection lenses and project the images onto screens. [0006] Among such display devices, liquid-crystal devices as well as the small CRTs are in widespread use...

AI Technical Summary

Benefits of technology

[0037] Accordingly, it is an object of the present invention to provide a projection-type image display apparatus that can efficiently cool a light-source unit and a display device.

[0039] According to the projection-type image display apparatus of the present invention, the light-source unit and the display device can be efficiently cooled.

Problems solved by technology

In addition to the self-heating, reflective display devices generate heat due to a reflection loss, and transmissive display devices generate heat due to a transmission loss.

However, the arrangements are not applicable to projection-type image display apparatuses having different circuit configurations or modes.

However, since the projection-type image display apparatus disclosed in U.S. Pat. No. 6,682,197 includes the intake fan and the exhaust fan at the front left and the front right thereof, the duct structure connecting the intake fan and the exhaust fan is not linear, and includes a plurality of bending portions and wind-direction guides at certain positions thereof.

As a result, it is estimated that the pressure loss of this duct structure will be high compared with that of a linear duct structure.

Therefore, if the heat generated by the light-source unit and the display devices is increased due to the high brightness, there is a possibility of insufficient cooling capacity caused by insufficient air volume unless the number of the fans or the power of the fans is increased.

In addition, noise is increased with the number of the fans or the power of the fans.

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